Description

Malic Acid

Malic acid is the main acid in many fruits such as apricots, blackberries, blueberries, cherries, grapes, peaches, pears, plums, and quince. It is present in lower concentrations in other fruits, such as citrus.

It contributes to the sourness of unripe apples. Sour apples contain high proportions of the acid. It is present in grapes and in most wines with concentrations sometimes as high as 5 g/L. It confers a tart taste to wine; the amount decreases with increasing fruit ripeness. The taste of malic acid is very clear and pure in rhubarb, a plant for which it is the primary flavour.

As it is the main acid in apples, it is the best acid to add to cider to adjust the pH level.

Malic is less sour than tartaric acid and can also be used to make acid adjustments in Rieslings, Gewurztraminer, and Muscat varieties. However,  many winemakers still prefer to use tartaric acid in these situations. You would not want to add Malic acid to any wine that will undergo a malolactic fermentation. As a note: only half of the artificially added malic acid will convert to lactic acid during a malolactic fermentation.

It is an important acid in winemaking that helps improve the balance, freshness, and structure of a wine. Winemakers often use it when a wine needs more natural-tasting acidity.

Why Winemakers Use Malic Acid

1. Adds Fresh, Crisp Acidity
It gives wine a bright, tart flavour similar to green apples. This helps wines taste fresher and more lively.

2. Balances Sweetness and Flavour
When a wine tastes too soft or sweet, adding it helps balance the sweetness and improves the overall taste.

3. Improves Fruit Wines and Country Wines
Many fruit wines naturally have low acidity. It helps give these wines a more natural fruit profile and better structure.

4. Supports Natural Winemaking Processes
It plays a role in malolactic fermentation, where bacteria convert malic acid into lactic acid. This process:

• Softens sharp acidity
• Creates a smoother mouthfeel
• Adds complexity to the wine

5. Helps Create a More Balanced Wine
The right acidity level is essential for a good wine. It helps winemakers adjust acidity so the wine tastes clean, balanced, and refreshing.